{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "o-rings-metric",
 "name": "O-rings, common metric sizes (ISO 3601)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Magnets & seals",
 "year": null,
 "question": "How do I size an O-ring groove for a 3D-printed lid?",
 "tags": [
  "o-ring",
  "seal",
  "gasket",
  "groove",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "o ring",
  "oring groove",
  "iso 3601",
  "nitrile o-ring"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": true,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/o-rings-metric/",
 "sheet_txt": "https://xemstudio.com/objects/o-rings-metric/sheet.txt",
 "sheet": {
  "basis": "ISO 3601; groove rules of thumb for static face seals",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Cross-sections (CS) are standardized: 1.0, 1.5, 1.78, 2.0, 2.4, 2.62, 3.0, 3.53 mm. Inside diameter is nearly continuous.",
   "Static face-seal groove: depth = 0.75 × CS, width = 1.35 × CS, so the ring is squeezed ~25% and has room to spread. Printed grooves: smooth the floor (ironing or sand) or it won't seal."
  ],
  "table": {
   "columns": [
    "cross_section_mm",
    "groove_depth_mm",
    "groove_width_mm"
   ],
   "rows": [
    [
     1.5,
     1.1,
     2
    ],
    [
     1.78,
     1.35,
     2.4
    ],
    [
     2,
     1.5,
     2.7
    ],
    [
     2.4,
     1.8,
     3.2
    ],
    [
     2.62,
     2,
     3.5
    ],
    [
     3,
     2.25,
     4
    ],
    [
     3.53,
     2.65,
     4.8
    ]
   ]
  }
 },
 "sheet_text": "O-rings, common metric sizes (ISO 3601) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/o-rings-metric/  (CC BY 4.0)\nBasis: ISO 3601; groove rules of thumb for static face seals\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Cross-sections (CS) are standardized: 1.0, 1.5, 1.78, 2.0, 2.4, 2.62, 3.0, 3.53 mm. Inside diameter is nearly continuous.\n- Static face-seal groove: depth = 0.75 × CS, width = 1.35 × CS, so the ring is squeezed ~25% and has room to spread. Printed grooves: smooth the floor (ironing or sand) or it won't seal.\n\ncross_section_mm  groove_depth_mm  groove_width_mm\n1.5  1.1  2.0\n1.78  1.35  2.4\n2.0  1.5  2.7\n2.4  1.8  3.2\n2.62  2.0  3.5\n3.0  2.25  4.0\n3.53  2.65  4.8\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: O-rings (free STEP/IGES/STL per part, for your own design use; no redistribution) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/o-rings/\n- Wikipedia: O-ring — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/O-ring\n\nXem Studio scan: not needed; this is a published standard. The sheet is the geometry.\nAPI: https://xemstudio.com/api/geometry?object=o-rings-metric\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "O-rings (free STEP/IGES/STL per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/o-rings/",
   "formats": [
    "STEP",
    "IGES",
    "STL",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "O-ring",
   "url": "https://en.wikipedia.org/wiki/O-ring",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-end-cap",
  "schedule-40-pipe",
  "dowel-pins-metric"
 ],
 "faq": [
  {
   "q": "What groove size for a 2 mm cross-section O-ring?",
   "a": "Static face seal: 1.5 mm deep, 2.7 mm wide (0.75 × CS deep, 1.35 × CS wide, 25% squeeze). Iron or sand the groove floor on a print."
  },
  {
   "q": "What are the standard O-ring cross-sections?",
   "a": "1.0, 1.5, 1.78, 2.0, 2.4, 2.62, 3.0 and 3.53 mm (ISO 3601). Inside diameters are nearly continuous, so pick the CS first then the ID."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/o-rings-metric/index.md"
}